Journal of Polymer Science Part B: Polymer Physics

Cover image for Vol. 52 Issue 8

15 April 2014

Volume 52, Issue 8

Pages i–iv, 553–609

  1. Cover Image

    1. Top of page
    2. Cover Image
    3. Communication
    4. Full Papers
    1. You have free access to this content
      Cover Image, Volume 52, Issue 8 (pages i–ii)

      Version of Record online: 1 MAR 2014 | DOI: 10.1002/polb.23468

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      Spiders use pyriform silk as an adhesive for the attachment of webs to a variety of surfaces. “Staple pin” architecture is an efficient architectural design used by spiders to lay multiple pyriform fibers on the underlying dragline silk. On page 553, Dharamdeep Jain, Vasav Sahni, and Ali Dhinojwala use electrospinning to fabricate a synthetic adhesive attachment staple pin. The cover collage of four scanning electron microscopy images shows the underlying nylon fiber (30-micron diameter) covered with electrospun polyurethane fibers on an aluminum substrate. The spacing can be controlled using the collector speed. The architectural design holds potential for producing adhesives for applications in biomedical and consumer industries.

    2. You have free access to this content
      Cover Image, Volume 52, Issue 8 (pages iii–iv)

      Version of Record online: 1 MAR 2014 | DOI: 10.1002/polb.23469

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      A blue fluorescent polymer based on poly(vinyl carbazole) and terfluorene, combined to make a chemical hybrid at the carbazole unit, is characterized by Shang-Hui Ye et al. on page 587. The cover illustrates the organic light-emitting diodes (OLEDs) device structure used in this study. The background shows an atomic force microscopy image of a smooth, homogeneous, amorphous film used in the OLEDs as an active layer, which is important for the device fabrication.

  2. Communication

    1. Top of page
    2. Cover Image
    3. Communication
    4. Full Papers
    1. Synthetic adhesive attachment discs inspired by spider's pyriform silk architecture (pages 553–560)

      Dharamdeep Jain, Vasav Sahni and Ali Dhinojwala

      Version of Record online: 13 FEB 2014 | DOI: 10.1002/polb.23453

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      Spiders attach their silk dragline fibers to surfaces using attachment discs spun from pyriform silk. These attachment discs are used for locomotion and to attach their webs to a variety of surfaces. Here, a simple electrospinning process is demonstrated to mimic the “staple-pin” architecture used by spiders for these attachment discs. The results provide a unique architectural design for fabricating adhesives that uses very little material for various biomedical and material science applications.

  3. Full Papers

    1. Top of page
    2. Cover Image
    3. Communication
    4. Full Papers
    1. Growth of poly(3,4-ethylenedioxythiophene) films prepared by base-inhibited vapor phase polymerization (pages 561–571)

      Jörgen Metsik, Kristjan Saal, Uno Mäeorg, Rünno Lõhmus, Silver Leinberg, Hugo Mändar, Margus Kodu and Martin Timusk

      Version of Record online: 6 FEB 2014 | DOI: 10.1002/polb.23450

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      Poly(3,4-ethylenedioxythiophene) (PEDOT) films are grown using base-inhibited vapor phase polymerization. The preparation of PEDOT films on patterned indium tin oxide-coated glass substrates enables the measurement of the resistance of PEDOT-oxidant films during polymer growth. This method is suitable for conveniently monitoring the polymerization process and investigating the influence of different environmental factors on the sheet resistances of the polymer films.

    2. Enhanced electrochemical properties of a novel polyvinyl formal membrane supporting gel polymer electrolyte by Al2O3 modification (pages 572–577)

      Yan Wen, Fang Lian, Yan Ren and Hong-Yan Guan

      Version of Record online: 7 FEB 2014 | DOI: 10.1002/polb.23448

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      Polyvinyl formal based dense polymer membranes doped with nano-Al2O3 are prepared for use as gel polymer electrolytes (GPEs) in lithium ion batteries using a phase-inversion method. The polymer membrane with 3 wt % nano-Al2O3 doping shows improved mechanical strength and electrolyte uptake. The membrane absorbs and swells in liquid electrolytes to form a stable GPE with a higher ionic conductivity than the undoped membrane, a wide electrochemical stability window of 1.2–4.8 V (vs. Li/Li+), and good compatibility with LiFePO4 electrodes.

    3. First principle studies of charge transport in PPV polymer under conformational deformation (pages 578–586)

      Ramon Gomez-Aguilar and Jaime Ortiz-Lopez

      Version of Record online: 10 FEB 2014 | DOI: 10.1002/polb.23454

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      Computational simulations are used to study charge transport along a poly(p-phenylene vinylene) (PPV) polymer chain subjected to torsional deformations. Current–voltage characteristics in a two-probe configuration are obtained as a function of the angle and degree of torsional sharpness. Calculations are performed with density functional theory combined with the nonequilibrium Green's function method. A sharp torsion localized in a single bond modulates PPV conductance, which becomes minimal when the torsional angle is 100°.

    4. Solution-processed high-performance orange phosphorescent and white PLEDs with a high color-rendering index from an unprecedented π-stacked and π-conjugated host material (pages 587–595)

      Shang-Hui Ye, Cheng-Rong Yin, Zhou Zhou, Tian-Qing Hu, Yong-Hua Li, Lu Li, Ling-Hai Xie and Wei Huang

      Version of Record online: 18 FEB 2014 | DOI: 10.1002/polb.23455

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      A π-stacked poly(vinyl carbazole) (PVK) and π-conjugated oligo/polyfluorene fluorescent hybrid bulk material is developed. The system exhibits efficient emission characteristics in the blue region and can be used as a host for phosphorescent dopants. High-performance orange phosphorescent and hybrid white polymer light-emitting diodes (PLEDs) with a high color rendering index are fabricated using a simple solution process method. The hybrid white device has a wide emission spectrum covering the whole visible region.

    5. Multilayer films composed of conductive poly(3-hydroxybutyrate)/carbon nanotubes bionanocomposites and a photoresponsive conducting polymer (pages 596–602)

      Luca Valentini, Paola Fabbri, Massimo Messori, Micaela Degli Esposti and Silvia Bittolo Bon

      Version of Record online: 17 FEB 2014 | DOI: 10.1002/polb.23459

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      A common configuration of an optoelectronic device consists of an anode made of transparent and conducting indium tin oxide (ITO) film on glass/polymer. ITO, however, is very brittle. Recently, there has been interest in the development of bio-based optoelectronic materials. In this work, a photoresponsive device is fabricated directly onto a conductive and semi-transparent biodegradable polymeric substrate. The developed device can find applications in advanced fields such as biodegradable electronic devices.

    6. Lotus bioinspired superhydrophobic, self-cleaning surfaces from hierarchically assembled templates (pages 603–609)

      Audrey Yoke Yee Ho, Emma Luong Van, Chee Tiong Lim, Sriram Natarajan, Noha Elmouelhi, Hong Yee Low, Murty Vyakarnam, Kevin Cooper and Isabel Rodriguez

      Version of Record online: 20 FEB 2014 | DOI: 10.1002/polb.23461

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      Hierarchical architectures that emulate the function of the lotus leaf are created from multi-scale hierarchical assembled templates directly nanoimprinted on thermoplastic polymers. This hierarchical microsurface and nanosurface topography exhibits a superhydrophobic behavior and self-cleaning properties with static contact angle values up to 160° and contact angle hysteresis below 10°. The superhydrophobic behavior remained more than 1 year after fabrication, which demonstrates the stability of these polymeric self-cleaning topographies.

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